Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control, Department of Environmental Science and Engineering, North China Electric Power University, Baoding 071003, China; MOE Key Laboratory of Resources and Environmental Systems Optimization, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
J Colloid Interface Sci. 2022 Feb 15;608(Pt 3):2768-2778. doi: 10.1016/j.jcis.2021.11.004. Epub 2021 Nov 4.
In this work, a wealth of triazine units was created in carbon nitride through a facile molten salt method to bridge titania and carbon nitride for accelerating charge transportation and enhancing hydrogen production performance. The doping of triazine ring into CN framework results in more exposure of - CN - and - CN bond and forms a homojunction (MCN), which favors photocatalysis by acting as photoresponse and active centers, respectively. Moreover, the triazine units can bridge the hybridized CN and TiO, forming a stable MCN/TiO homo-heterojunction. Attributed to the matched band energy structure of MCN and TiO and the structural characteristics of triazine/heptazine heterocyclic, the light response, charge separation and transfer as well as the lifetime of carriers on MCN/TiO hybrid are improved significantly. As a result, the MCN/TiO homo-heterojunction exhibits excellent activity and stability for photocatalytic hydrogen production performance, up to 2594 μmol∙g∙h under simulated solar irradiation, which is 5.5 times higher than that of the bare g-CN.
在这项工作中，通过简便的熔融盐法在氮化碳中构建了丰富的三嗪单元，以桥接二氧化钛和氮化碳，从而加速电荷转移并提高制氢性能。三嗪环掺杂到 CN 骨架中会导致更多的 -CN- 和 -CN 键暴露，并形成同质结（MCN），分别作为光响应和活性中心有利于光催化。此外，三嗪单元可以桥接杂化的 CN 和 TiO2，形成稳定的 MCN/TiO 同型异质结。归因于 MCN 和 TiO 的匹配能带能量结构以及三嗪/六嗪杂环的结构特征，MCN/TiO 杂化的光响应、电荷分离和转移以及载流子的寿命得到显著提高。结果，MCN/TiO 同型异质结表现出优异的光催化制氢性能的活性和稳定性，在模拟太阳光照射下达到 2594 μmol·g·h-1，是裸 g-CN 的 5.5 倍。
